Family name Koen (Koen 
, 科恩 
, Кун 
, among others...) , all around the world, is a common surname. The family name Koen is characteristic of Namibia, where it is quite a common surname, South Africa, and Suriname, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in South Africa, Indonesia, and the United States. More prevalently, Koen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Koen | Japan, Indonesia, South Africa, Belgium, Netherlands |
| 科恩 | China |
| Кун | Ukraine, Kazakhstan, Russia, Belarus, Kyrgyzstan |
| Коен | Ukraine, Russia, Bulgaria, Israel, Kyrgyzstan |
| Коэн | Russia, Israel, Lithuania, Kyrgyzstan |
| gisbertus koen Dutch classical philologist, NL (b. 1736) |
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| jacob jan gijsbert koen Netherlands Marine Corps personel, NL (b. 1848) |
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| klaas koen (b. 1852) |
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| be kwat koen (b. 1863) |
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tanja koen Dutch television presenter and presenter, NL (b. 1925) |
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| frits koen Dutch fencer (b. 1876) |
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frank koen Dutch politician, NL (b. 1956) |
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erwin koen Dutch footballer, NL (b. 1978) |
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| nel koen Dutch painter, NL (b. 1934) |
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| billy koen nuclear engineer, author, and professor emeritus (b. 1938) |
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| charles koen American activist, US (b. 1945) |
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| zozeph koen GR (b. 1937) |
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| mirjam koen Dutch actor and theatre director, NL (b. 1948) |
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| karleen koen American writer, US (b. 1948) |
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| johnny koen cyclist, ZA (b. 1957) |
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